#ifndef __LWIPOPTS_H__
#define __LWIPOPTS_H__

#include "FreeRTOSConfig.h"

/**
 * SYS_LIGHTWEIGHT_PROT==1: if you want inter-task protection for certain
 * critical regions during buffer allocation, deallocation and memory
 * allocation and deallocation.
 */
#define SYS_LIGHTWEIGHT_PROT    1

/**
 * NO_SYS==1: Provides VERY minimal functionality. Otherwise,
 * use lwIP facilities.
 */
#define NO_SYS                  0

/**
 * NO_SYS_NO_TIMERS==1: Drop support for sys_timeout when NO_SYS==1
 * Mainly for compatibility to old versions.
 */
#define NO_SYS_NO_TIMERS        0

/* ---------- Memory options ---------- */
/* MEM_ALIGNMENT: should be set to the alignment of the CPU for which
   lwIP is compiled. 4 byte alignment -> define MEM_ALIGNMENT to 4, 2
   byte alignment -> define MEM_ALIGNMENT to 2. */
//??4??????
#define MEM_ALIGNMENT           4

/* MEM_SIZE: the size of the heap memory. If the application will send
a lot of data that needs to be copied, this should be set high. */
//MEM_SIZE:heap?????,?????????????????????????
#define MEM_SIZE                (20*1024)

/* MEMP_NUM_PBUF: the number of memp struct pbufs. If the application
   sends a lot of data out of ROM (or other static memory), this
   should be set high. */
//MEMP_NUM_PBUF:memp???pbuf??,?????ROM??????????????,??????????
#define MEMP_NUM_PBUF           100

/* MEMP_NUM_UDP_PCB: the number of UDP protocol control blocks. One
   per active UDP "connection". */
//MEMP_NUM_UDP_PCB:UDP?????(PCB)??.?????UDP"??"????PCB.
#define MEMP_NUM_UDP_PCB        2

/* MEMP_NUM_TCP_PCB: the number of simulatenously active TCP
   connections. */
//MEMP_NUM_TCP_PCB:???????TCP??
#define MEMP_NUM_TCP_PCB        10

/* MEMP_NUM_TCP_PCB_LISTEN: the number of listening TCP
   connections. */
//MEMP_NUM_TCP_PCB_LISTEN:?????TCP????
#define MEMP_NUM_TCP_PCB_LISTEN 6

/* MEMP_NUM_TCP_SEG: the number of simultaneously queued TCP
   segments. */
//MEMP_NUM_TCP_SEG:?????????TCP???
#define MEMP_NUM_TCP_SEG        20

/* MEMP_NUM_SYS_TIMEOUT: the number of simulateously active
   timeouts. */
//MEMP_NUM_SYS_TIMEOUT:???????timeout??
#define MEMP_NUM_SYS_TIMEOUT    10


/* ---------- Pbuf options ---------- */
/* PBUF_POOL_SIZE: the number of buffers in the pbuf pool. */
//PBUF_POOL_SIZE:pbuf?????.
#define PBUF_POOL_SIZE          20

/* PBUF_POOL_BUFSIZE: the size of each pbuf in the pbuf pool. */
//PBUF_POOL_BUFSIZE:??pbuf?????.
#define PBUF_POOL_BUFSIZE       1500


/* ---------- TCP options ---------- */
#define LWIP_TCP                1   //?1???TCP
#define TCP_TTL                 255 //????

/* Controls if TCP should queue segments that arrive out of
   order. Define to 0 if your device is low on memory. */
/*?TCP?????????????,???????????????0*/
#define TCP_QUEUE_OOSEQ         0

/* TCP Maximum segment size. */
//??TCP??                                                     //TCP_MSS = (MTU - IP???? - TCP????
#define TCP_MSS                 (1500 - 40)   /* TCP_MSS = (Ethernet MTU - IP header size - TCP header size) */

/* TCP sender buffer space (bytes). */
//TCP???????(bytes).
#define TCP_SND_BUF             (4*TCP_MSS)

/*  TCP_SND_QUEUELEN: TCP sender buffer space (pbufs). This must be at least
  as much as (2 * TCP_SND_BUF/TCP_MSS) for things to work. */
//TCP_SND_QUEUELEN: TCP???????(pbuf).??????(2 * TCP_SND_BUF/TCP_MSS)
#define TCP_SND_QUEUELEN        (4* TCP_SND_BUF/TCP_MSS)

/* TCP receive window. */
//TCP????
#define TCP_WND                 (2*TCP_MSS)


/* ---------- ICMP options ---------- */
#define LWIP_ICMP                       1   //??ICMP??


/* ---------- DHCP options ---------- */
/* Define LWIP_DHCP to 1 if you want DHCP configuration of
   interfaces. DHCP is not implemented in lwIP 0.5.1, however, so
   turning this on does currently not work. */
#define LWIP_DHCP               0


/* ---------- UDP options ---------- */
#define LWIP_UDP                1    //??UDP??
#define UDP_TTL                 255  //UDP???????


/* ---------- Statistics options ---------- */
//#define LWIP_STATS 1
//#define LWIP_STATS_DISPLAY 1


#define LWIP_PROVIDE_ERRNO

/* ---------- link callback options ---------- */
/* LWIP_NETIF_LINK_CALLBACK==1: Support a callback function from an interface
 * whenever the link changes (i.e., link down)
 */
#define LWIP_NETIF_LINK_CALLBACK        0
/*
   --------------------------------------
   ---------- Checksum options ----------
   --------------------------------------
*/

/*
The STM32F4x7 allows computing and verifying the IP, UDP, TCP and ICMP checksums by hardware:
 - To use this feature let the following define uncommented.
 - To disable it and process by CPU comment the  the checksum.
*/
#define CHECKSUM_BY_HARDWARE


#ifdef CHECKSUM_BY_HARDWARE
  /* CHECKSUM_GEN_IP==0: Generate checksums by hardware for outgoing IP packets.*/
  #define CHECKSUM_GEN_IP                 0
  /* CHECKSUM_GEN_UDP==0: Generate checksums by hardware for outgoing UDP packets.*/
  #define CHECKSUM_GEN_UDP                0
  /* CHECKSUM_GEN_TCP==0: Generate checksums by hardware for outgoing TCP packets.*/
  #define CHECKSUM_GEN_TCP                0
  /* CHECKSUM_CHECK_IP==0: Check checksums by hardware for incoming IP packets.*/
  #define CHECKSUM_CHECK_IP               0
  /* CHECKSUM_CHECK_UDP==0: Check checksums by hardware for incoming UDP packets.*/
  #define CHECKSUM_CHECK_UDP              0
  /* CHECKSUM_CHECK_TCP==0: Check checksums by hardware for incoming TCP packets.*/
  #define CHECKSUM_CHECK_TCP              0
  /* CHECKSUM_CHECK_ICMP==0: Check checksums by hardware for incoming ICMP packets.*/
  #define CHECKSUM_GEN_ICMP               0
  #define CHECKSUM_CHECK_ICMP             0
#else
  /* CHECKSUM_GEN_IP==1: Generate checksums in software for outgoing IP packets.*/
  #define CHECKSUM_GEN_IP                 1
  /* CHECKSUM_GEN_UDP==1: Generate checksums in software for outgoing UDP packets.*/
  #define CHECKSUM_GEN_UDP                1
  /* CHECKSUM_GEN_TCP==1: Generate checksums in software for outgoing TCP packets.*/
  #define CHECKSUM_GEN_TCP                1
  /* CHECKSUM_CHECK_IP==1: Check checksums in software for incoming IP packets.*/
  #define CHECKSUM_CHECK_IP               1
  /* CHECKSUM_CHECK_UDP==1: Check checksums in software for incoming UDP packets.*/
  #define CHECKSUM_CHECK_UDP              1
  /* CHECKSUM_CHECK_TCP==1: Check checksums in software for incoming TCP packets.*/
  #define CHECKSUM_CHECK_TCP              1
  /* CHECKSUM_CHECK_ICMP==1: Check checksums by hardware for incoming ICMP packets.*/
  #define CHECKSUM_GEN_ICMP               1
#endif


/*
   ----------------------------------------------
   ---------- Sequential layer options ----------
   ----------------------------------------------
*/
/**
 * LWIP_NETCONN==1: Enable Netconn API (require to use api_lib.c)
 * LWIP_NETCONN==1:??NETCON??(????api_lib.c)
 */
#define LWIP_NETCONN                    1

/*
   ------------------------------------
   ---------- Socket options ----------
   ------------------------------------
*/
/**
 * LWIP_SOCKET==1: Enable Socket API (require to use sockets.c)
 * //LWIP_SOCKET==1:??Socket API(????sockets.c)
 */
#define LWIP_SOCKET                     1

/*
   ---------------------------------
   ---------- OS options ----------
   ---------------------------------
*/

#define DEFAULT_UDP_RECVMBOX_SIZE       10
#define DEFAULT_TCP_RECVMBOX_SIZE       10
#define DEFAULT_ACCEPTMBOX_SIZE         10
#define DEFAULT_THREAD_STACKSIZE        1024


#define TCPIP_THREAD_NAME              "lwip"
#define TCPIP_THREAD_STACKSIZE          1024
#define TCPIP_MBOX_SIZE                 8
#define TCPIP_THREAD_PRIO               (configMAX_PRIORITIES - 2)

#endif /* __LWIPOPTS_H__ */

